<div class="login-panel">
    <p>
        <md-input-container class="example-full-width">
            <input mdInput placeholder="用户名" type="text" />
        </md-input-container>
    </p>
    <p>
        <md-input-container class="example-full-width">
            <input mdInput placeholder="密码" type="password" />
        </md-input-container>
    </p>
    <p>
        <button md-button color="primary" id="login">登 录</button>
    </p>
</div>